For me, one of the most tedious parts of writing HTML is the img tag. Specifically, filling in the width and height parameters. This is compounded by having to figure out the image's dimensions. OS X's Quick Look feature makes this a little easier because it displays the dimensions in the title bar, but you still have to remember if they're displayed in width/height or height/width order. (It's the former, by the way.)
Now this isn't exactly digging ditches, so pardon my white collar whine, but I finally had enough of doing all this by hand so I wrote a script to automate the process. You pass the script an image file and it outputs a complete tag, ready for inserting in your HTML. The output looks like this:
< img src="http://www.chicagomagicstudio.com/map/gfx/ShawMahatma1895.png" width="366" height="183" >< /br>TITLE
Since my primary motivation in creating this is laziness, I made the script output the exact img tag that I need. It includes the path to the graphics file on my website, and the placeholder "TITLE" and linefeed. You'll obviously want to change these for your site. Adding an alt tag is left as an exercise for the reader.
You can download my imgref script from github. I hope you find it useful.